For solar hot water use, experiment and research for rainwater use
On 2016-12-22 14:53:11
To experiment with opening the water supply / drain port on the side wall ① It must be rectangular parallelepiped ② It is indispensable that the wide mouth is large enough for hands to enter. It was a big help because we had only 10L, 20L poly tanks in trouble. Better if the outer lid becomes stronger. Note) Personal name is anonymous. I will write a production article using this for the next book.